new Vue

<template>
  <div id="app">
     <aaa/>
     <hr>
     <bbb/>
  </div>
</template>

<script>
import Vue from 'vue'
var Event = new Vue();
export default {
  name: 'App',
  data(){
    return{

    }
  },
  components:{
    aaa:{
      template:`<div>我是aaa組件<p>{{msg}}</p></div>`,
      data(){
        return{
          msg:'msg-aaa'
        }
      },
      mounted(){
        var that = this;
        Event.$on('zxc',(val)=>{
          this.msg = val;
        })
      }
    },
    bbb:{
      template:`<div>我是bbb組件<p>{{msg}}</p><input v-model="msg" @keyup.13="eemmiitt"/></div>`,
      data(){
        return{
          msg:'msg-bbb'
        }
      },
      methods:{
        eemmiitt(){
          console.log(this.msg);
          Event.$emit('zxc',this.msg)
        }
      }
    }
  }
}
</script>

<style>

</style>